Overall provisional results before appeals and re-marks show that the percentage of students achieveing A*-C in English and maths rose by 7% per cent to 84 per cent.
Some 81 per cent of students also achieved at least five A* to Cs, including English and maths – up 5 per cent on last year's results.
Headteacher Phillip Wheatley said: "We are very pleased that Glyn's boys and their families are celebrating such pleasing results. The governors and staff at Glyn are delighted with the achievements of our Year 11 students.
"We are grateful to our parents for the support they have given to their sons over the years and I would like to pay tribute to my colleagues for their commitment to all Glyn students resulting in such success."
Daniel Davies was one of the standout performers with 11 A* grades and 2 As and he is now hoping to replicate his success at A Level, studying physics, chemistry, maths and further maths at Glyn's Sixth Form.
He said: "I've done a lot better than I thought I would. I was thinking I'd have got 6 A*s and the rest As so to have got these results was a good surprise.
"I'm really happy right now, and just pleased that all my hard work over the past two years has paid off."
Kieran Gall was another top performer with 9 A* grades and 2 As. He is staying on at Glyn to take A-Levels in further maths, computer science and physics.
"I was pretty nervous when I came in to collect my results but I was fairly confident I'd done well. Now, having them in my hand, I'm really relieved," he said
Kieran, who hopes to study maths or computer science at university, added: "I chose to stay on at Glyn because I've really enjoyed my time here."
Matthew Levy and Luke Laidlaw were other high achievers. After getting 7 A* grades and 5 As, Matthew will be staying at Glyn to study maths, further maths, physics and chemistry.
Luke has also opted to stay at Glyn to tackle maths, biology and chemistry at A Level after securing 8 A* grades, 2 As, and 2 Bs.
Luke added: "I was particularly happy to get A* in biology and English literature because I thought the exams were very difficult."
The 16-year-old, who hopes to study medicine at university, added: "It was an easy choice for me to stay at Glyn for Sixth Form because it's a great school and the teachers here are brilliant."
Another delighted student was Will Ladd who got 6 A* grades, 5 As, and 1 B – although he admits he was incredibly nervous before collecting his results.
"I barely slept last night but right now, I'm really pleased," he said. "I honestly didn't think I would do this well especially in science, where I got 3 A*s. More than anything, I really happy I beat my brother."
Will now cannot wait to begin his A Level studies in maths, mechanics, physics, and law. He added: "Glyn is a really good school and the new building for the sixth form is really impressive."
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